Use Cases of Facade Method Design Pattern

• Simplifying Complex External Systems:
  • A facade encapsulates database connection, query execution, and result processing, offering a clean interface to the application.
  • A facade simplifies the usage of external APIs by hiding the complexities of authentication, request formatting, and response parsing.
  • A facade can create a more user-friendly interface for complex or poorly documented libraries.
• Layering Subsystems:
  • Decoupling subsystems: Facades define clear boundaries between subsystems, reducing dependencies and promoting modularity.
  • Providing high-level views: Facades offer simplified interfaces to lower-level subsystems, making them easier to understand and use.
• Providing a Unified Interface to Diverse Systems:
  • Integrating multiple APIs: A facade can combine multiple APIs into a single interface, streamlining interactions and reducing code duplication.
  • Bridging legacy systems: A facade can create a modern interface for older, less accessible systems, facilitating their integration with newer components.
• Protecting Clients from Unstable Systems:
  • Isolating clients from changes: Facades minimize the impact of changes to underlying systems by maintaining a stable interface.
  • Managing third-party dependencies: Facades can protect clients from changes or issues in external libraries or services.

Facade Method Design Pattern is a part of the Gang of Four design patterns and it is categorized under Structural design patterns. Before we dive deep into the details of it, imagine a building, the facade is the outer wall that people see, but behind it is a complex network of wires, pipes, and other systems that make the building function. The facade pattern is like that outer wall. It hides the complexity of the underlying system and provides a simple interface that clients can use to interact with the system.